factor Protocols

Category: RNA Protocols: RNA-binding Protein Purification

A high yield affinity purification method for specific RNA-binding proteins: isolation of the iron regulatory factor from human placenta. Neupert 1990. - [Read A high yield affinity purification method for specific RNA-binding proteins.]

Category: DNA Protocols: EMSA DNA-Protein Protocols

A non-radioactive electrophoretic mobility shift assay based on the digoxigenin detection system had been developed and applied to the analysis of the interaction between the heat shock transcription factor and the heat shock element of N. crassa. (Bioch - [Read A non-radioactive electrophoretic mobility shift assay for the detection of heat shock element (HSE)]

Category: BACs Bacterial Artificial Chromosome Protocols

Information for BACs, Bacterial Artificial Chromosomes. Includes: Existing vectors; pBAC108L; pBeloBAC11; pBACe3.6; pFW11 and F' factor; pCC1BAC; pSMART VC Vectors; pIndigoBAC-5; Cosmids; pWEB-TNCTM; SuperCos 1; pFos1; PAC vectors; BAC purification; Putting the BAC into E. coli. - [Read BACs Bacterial Artificial Chromosomes]

Category: Immunology: Chemotaxis

Chemotaxis Assay, Springer Lab. A chemotaxis assay's function is to assess whether a factor or molecule of interest has chemotactic activity on a motile cell type. Chemotaxis is the ability of a factor to cause the migration of a cell. The chemotactic assay is based on the creation of a chemical gradient of the chemotactic agent which will cause cells to migrate through the gradient towards the chemotactic agent. - [Read Chemotaxis Assay]

Category: Cell Biology and Cell Culture: Cell Cycle Protocols: Mitosis Protocols

Cytostatic factor extract (CSF) preparation for spindle assembly protocol. Protocol includes tips such as: The quality of the eggs is essential for good CSF extracts. Always sacrifice quantity for quality when trying to make functional extracts. - [Read Cytostatic Factor (CSF) Extract Preparation for Spindle Assembly Protocol]

Category: Xenopus Protocols: Xenopus Egg Extracts Protocols

Protocol for cytostatic factor extract preparation for spindle assembly. The quality of the eggs is essential for good CSF extracts. Always sacrifice quantity for quality when trying to make functional extracts. Discard any batches of eggs that have "puff balls" or activated eggs that constitute more than 10% of the eggs. Use laid eggs and collect eggs at about 16 to 17 hours after priming with Progesterone (found in Pregnant Mare Serum Gonadotropin (PMSG)). - [Read Cytostatic Factor (CSF) Extract Preparation for Xenopus Spindle Assembly Protocol]

Category: Stem Cell Protocols: Stem Cell Culture Protocols

In vitro differentiation of ES cells occurs when the cells are allowed to aggregate in suspension culture in the absence of mouse embryonic fibroblast (MEF) feeders and leukemia inhibitory factor (LIF). Hanging drops provide a uniform aggregate size, which is then expanded by continued growth in suspension culture. The embryoid bodies are then plated and allowed to differentiate further in culture. - [Read Differentiation of Embryonic Stem (ES) Cells Using the Hanging Drop Method]

Category: DNA Protocols: EMSA DNA-Protein Protocols

Magnetic DNA affinity purification of yeast transcription factor tau--a new purification principle for the ultrarapid isolation of near homogeneous factor. Gabrielsen et al. 1989 - [Read DNA-Binding Protein Purification with Dynabeads.]

Category: Yeast Protocols: Yeast Cell Synchrony Protocols

It is sometimes desirable to have an entire population of yeast cells that is growing synchronously or is arrested at a unique point in the cell cycle. - [Read Inducing Yeast Cell Synchrony: alpha-Factor Arrest Using bar1 Mutants Protocol]

Category: Yeast Protocols: Yeast Cell Synchrony Protocols

It is sometimes desirable to have an entire population of yeast cells that is growing synchronously or is arrested at a unique point in the cell cycle. - [Read Inducing Yeast Cell Synchrony: alpha-Factor Arrest Using Low Cell Concentration Protocol]

Category: Yeast Protocols: Yeast Cell Synchrony Protocols

It is sometimes desirable to have an entire population of yeast cells that is growing synchronously or is arrested at a unique point in the cell cycle. - [Read Inducing Yeast Cell Synchrony: alpha-Factor Arrest Using Low pH Protocol]

Category: Immunology: Mononuclear Cell Isolation Protocols

Mononuclear phagocyte progenitor cells derived from femoral and tibial bone marrow are propagated in the presence of M-CSF. This macrophage growth factor is secreted by L929 cells and is used in the form of L929 cell conditioned medium. The progenitor cells proliferate and differentiate through monoblast, promonocyte and monocyte stages before maturing to macrophages. At this time the cells become firmly adherent to the culture vessel. - [Read Isolation and Culture of Mouse Bone Marrow-Derived Macrophages Protocol]

Category: Stem Cell Protocols: Feeder Cell Preparation Protocols

This protocol describes the isolation of fibroblasts from mouse embryos. Mouse embryonic fibroblast (MEF) cells are used as a feeder layer for the culture of mouse embryonic stem (ES) cells to help maintain them as pluripotent stem cells. The inhibition of ES-cell differentiation provided by the MEF feeders appears to be due to their production of leukemia inhibitory factor (LIF). - [Read Isolation and Freezing of Primary Mouse Embryonic Fibroblasts (MEF) For Feeder Plates]

Category: Fungi Protocols: Aspergillus Protocols

Gliotoxin is a metabolite of Aspergillus fumigatus that exhibits immunosuppressive activity against certain cells of the immune system. Secretion of gliotoxin during infection has been suggested as being a factor in the pathogenesis of aspergillosis. Gliotoxin secretion can be assayed in a number of ways by thin layer chromatography (TLC) high performance liquid chromatography (HPLC) or bioassay using the effect of gliotoxin on human cells1. - [Read Method for Assaying Gliotoxin Production in Aspergillus fumigatus Protocol]

Category: DNA Protocols: SNP Protocols

MULTIPLEX SNP ANALYSIS: SCREENING FACTOR V R506Q (LEIDEN) MUTATIONS. Beckman Coulter. - [Read MULTIPLEX SNP ANALYSIS: SCREENING FACTOR V R506Q (LEIDEN) MUTATIONS]

Category: Drosophila Protocols: Drosophila Genetics Protocols

Protocol describes how to test whether a transcription factor disrupts the chromatin of a promoter of a gene of interest. First, chromatin is assembled in vitro on the gene of interest in the presence and absence of a transcriptional activator (see Protocol on Assembly of Chromatin with Drosophila S-190 Chromatin Assembly Extract and Transcriptional Activators). - [Read Nucleosomal Array Disruption Assay Protocol]

Category: Signalling Signal Transduction Protocols

Pheromone Halo Assay. Dohlman Lab Protocol. An assay which measures the responsiveness and effects of cells to a factor pheromone. - [Read Pheromone Halo Assay Protocol]

Category: Stem Cell Protocols: Feeder Cell Preparation Protocols

This protocol describes the culture of embryonic stem (ES) cells using mitotically inactivating primary mouse embryonic fibroblast (MEF) cells as a feeder layer (preparation described in Preparation of Mouse Embryonic Fibroblast (MEF) Feeder Plates). The ES culture medium is supplemented with recombinant leukemia inhibitory factor (LIF) to help maintain the cells as pluripotent stem cells. This protocol has been optimized for the ES-D3 cell line. - [Read Propagation of Pluripotent Mouse Embryonic Stem (ES) Cells Protocol]

Category: Stem Cell Protocols: Mouse Embryonic Fibroblasts Protocols

This protocol describes the culture of embryonic stem (ES) cells using mitotically inactivating primary mouse embryonic fibroblast (MEF) cells as a feeder layer (preparation described in Preparation of Mouse Embryonic Fibroblast (MEF) Feeder Plates). The ES culture medium is supplemented with recombinant leukemia inhibitory factor (LIF) to help maintain the cells as pluripotent stem cells. This protocol has been optimized for the ES-D3 cell line. - [Read Propagation of Pluripotent Mouse Embryonic Stem (ES) Cells Protocol]

Category: Cell Biology and Cell Culture: In Vitro Reconstitution Protocols

This protocol describes an in vitro reaction to assay mitotic spindle assembly. The assay uses Cytostatic Factor extract made from Xenopus eggs, fluorescently-labelled tubulin, and prepared sperm nuclei. Spindle assembly is monitored by immunofluorescence microscopy. - [Read Protocol Spindle Assembly In Vitro]

Category: Chromatography Protocols

Purification of Nuclear Factor DNA Recognition Site Affinity. PDF. - [Read Purification of Nuclear Factor DNA Recognition Site Affinity PDF]

Category: Plant Biology Protocols: Arabidopsis Transformation Protocols

Protocol for a simplified Arabidopsis transformation. Found that the MS salts, hormone, etc. make no difference, that OD of bacteria doesn't make much of a difference, that vacuum doesn't even make much of a difference as long as you have a decent amount of surfactant present. Plant health is still a major factor - healthy fecund plants make a big difference! With this method you should be able to achieve transformation rates above 1%. - [Read Simple Arabidopsis Transformation Protocol]

Category: Cell Biology and Cell Culture: ES Stem Cell Biology and Culture: ES Cell Growth Media and Requirements

Human embryonic stem cells are a valuable resource for research and cell replacement therapy but are notoriously cumbersome to culture. Bhatia and colleagues show that an increased dose of basic fibroblast growth factor eliminates the need for feeder laye - [Read Simplifying hESC culture]

Category: Reporter Gene Assays: Luciferase Assay Protocols

Transfection of primary leukocytes has traditionally been a challenging but much desired protocol. It allows not only the analysis of cells in a more natural state to a cell line system, it enables the direct comparison of, for e.g. transcriptional activity using luciferase reporters, in immune cells taken from genetically-altered mice. In addition, importantly it allows for "rescue experiments" in knockout cells & the ability to over-express or reconstitute wild-type and/or mutated constructs. - [Read Transfection of Bone Marrow-Derived Mast Cells for Transcription Factor Luciferase Reporter Assays]

Category: Xenopus Protocols: Xenopus Egg Extracts Protocols

Protocol describes the preparation of Cytostatic Factor (CSF) from frog eggs. CSF can be used in in vitro spindle assembly assays. Includes: Frog injections; Preparation Before Starting the Extract Preparation; Extract Preparation. - [Read Xenopus Egg CSF Extract Preparation Protocol]